The effect of spinning temperature (910℃ and 1000℃ ) and reduction ratio (0

10%

30%) during shear spinning on the microstructural evolution of Ti-22Al-25Nb alloy is investigated. The experimental results show that the microstructure of Ti-22Al-25Nb alloy consisted of α2 phase

B2 phase and O phase. During spinning process

B2 grains are elongated along the spinning direction. The equiaxed fine grains which distribute around the elongated grains are related to dynamic recrystallization. The spinning temperature can significantly affect the size and morphology of α2 phase and O phase. With the increasement of temperature

lamellar O phase become shorter and coarser

α2 phase tends to be equiaxed. Deformation affects the volume fraction of α2 phase and the morphology of O phase. Obviously

the volume fraction of α2 phase decreases and O phase transforms from lamellar to clubbed as the increasement of reduction ratio. Thus

not only the dynamic recrystallization and deformation of grains occur for Ti-22Al-25Nb alloy during shear spinning

but also involves the complex phase transition which is difficult to control.